Remove iOS conditions in content/ build files.

content/public/browser/BUILD.gn

Index: content/public/browser/BUILD.gn
diff --git a/content/public/browser/BUILD.gn b/content/public/browser/BUILD.gn
index 89fdec11fd4b0291c78b36563ebff7a09554c1bc..8de9dd8c4ea77fbd4bc5016cf68cc5bc020f794a 100644
--- a/content/public/browser/BUILD.gn
+++ b/content/public/browser/BUILD.gn
@@ -21,23 +21,9 @@ group("browser") {
 source_set("browser_sources") {
   visibility = [ "//content/*" ]
 
-  if (is_ios) {
-    # iOS doesn't get the normal file list and only takes these whitelisted
-    # files.
-    sources = [
-      "browser_main_parts.cc",
-      "content_browser_client.cc",
-      "favicon_status.cc",
-      "navigation_details.cc",
-      "notification_registrar.cc",
-      "page_navigator.cc",
-      "web_ui_controller.cc",
-    ]
-  } else {
-    sources = rebase_path(content_browser_gypi_values.public_browser_sources,
-                          ".",
-                          "//content")
-  }
+  sources = rebase_path(content_browser_gypi_values.public_browser_sources,
+                        ".",
+                        "//content")
 
   if (use_aura) {
     sources -= [ "context_factory.h" ]